IP multicast routing enables a host (source) to send a single copy of data to a single multicast address. Data is then distributed to a group of recipients using a special form of IP address called the IP multicast group address. You can configure multicast on a tier-0 gateway for an IPv4 network to enable multicast routing.


  1. With admin privileges, log in to NSX Manager.
  2. Select Networking > Tier-0 Gateways.
  3. To edit a tier-0 gateway, click the menu icon (three dots) and select Edit.
  4. Click the Multicast toggle to enable multicast.
  5. In the Replication Multicast Range field, enter an address range in CIDR format.
    Replication Multicast Range is a range of multicast group addresses (GENEVE outer destination IP) that is used in the underlay to replicate workload/tenant multicast group addresses. It is recommended that there is no overlap between the Replication Multicast Range and workload/tenant multicast group addresses.
  6. In the IGMP Profile drop-down list, select an IGMP profile.
  7. In the PIM Profile drop-down list, select a PIM profile.